Not that it's a cheaper alternative, but just to throw out there to you and others of your options. Mercedes Coolant is also a G-05 alternative along with the others already mentioned. (Mopar HOAT, Zerex G-05, and Motorcraft G-05). Much discussed topic at my Chrysler 300M Enthusiasts Club forum.
This quote was taken froma Mercedes forum...
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Zerex G-05 vs. the real Mercedes coolant
I had an e-mail exchange with the tech folks at Valvoline that I thought some of you might be interested in reading. The Zerex G-05 and the Mercedes coolant apparently are not identical, but probably close enough for government work.
ME: Is Zerex G-05 identical to the Mercedes branded coolant that I would buy at a dealership? Also, since it seems like AutoZone no longer carries Zerex G-05, where can I find it in my area?
ZEREX: Yes, the Zerex G-05 is the approved coolant for the Mercedez Benz application. Our biggest supplier for the product is Carquest Auto Parts. Other options include Napa, Auto Zone, Advance, O'Reilly's, & Pep Boys. If these places don't carry the product, please just ask them to order it for you.
ME: Thank you for your reply. Is the Zerex G-05 identical to the Mercedes branded coolant? Earlier this year there was a rebate on the purchase of the Zerex G-05. Are there any plans for a repeat of that promotion in the works?
ZEREX: It is not IDENTICAL, but the Mercedez formulation and Zerex G-05 are 100% compatible. I am not sure about promotions. Please give our hotline a call at 1-800 TEAM VAL and ask for promotions for this information.
Also note:
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What vehicles use Zerex G-05 in the factory fill and what is the dye color?
1984 Mercedes and beyond (light yellow)
1990 Deere and Company vehicles and beyond (green)
2001 Chrysler, Dodge, and Jeep and beyond (orange)
2002 Ford, Lincoln and Mercury trucks and SUVS and beyond (yellow)
2003 Ford, Lincoln, and Mercury automobiles and beyond (yellow)
What aftermarket products are approved by Ford and Chrysler?
Ford, Lincoln, Mercury brands - Ford Motorcraft Gold and Zerex G-05
Chrysler, Dodge, Jeep brands - Mopars 5/100 Antifreeze and Zerex G-05